Heat oven to 425°F. Cut the potatoes into wedges, toss with 2 tbsp oil and salt, and roast on a sheet pan 30 minutes, flipping once.
Mix the flaxseed with 5 tbsp water. Mash the drained chickpeas well, then mix in the minced garlic, cumin, panko, flax mixture, salt and pepper.
Shape into 4 patties about ¾ inch thick; chill 5 minutes if they feel soft.
Cook in the remaining oil in a skillet over medium heat 4-5 minutes per side until crisp and golden.
Serve on buns with lettuce, tomato and ketchup, with the fries on the side.
Photo: Theo Crazzolara / Unsplash